Tradingpost has 0 BMW M4 cars for sale between $20,000 and $30,000 in Port Stephens Area, NSW. As Australia's favourite way to buy and sell for over 50 years, Tradingpost is the trusted way to sell your current car, and find your next car at a great price! When looking to buy or sell a BMW M4 always be sure to check out the wide range listed on Tradingpost!